Tensioning and locking device for wire-binding mechanisms



1,636,777 y 1927' E. HOFFMANN TENSI'ONING AND LOCKING DEVICE FOR WIRE BINDING NECHANISIS Filed June 29, 1926 Patented July 26, 1927.

UNITED STATES 1,636,777 PATENT. OFFICE.

EMIL HOFFMANN, 0F COLOGNE, GERMANY.

TENSIONING AND LOCKING DEVICE FOR WIRE-BINDING MECHANISMS.

Application filed June 29, 1926, Serial No. 119,412, and in Germany July 1,1925.

The object of the present invention is a tensioning and locking device for wirebinding mechanisms, in which auxiliary holding members are provided which move together with the actual tensioning members, and hold the short cut ends of the wire, which are pushed past each other while tensioning is being effected, during the twisting operation. This device has in comparison with the known tensioning and looking devices for wire-binding mechauisms, in which the ends of the wires are drawn past each other, the advantage that the cutting to waste or loss, which takes place on cutting .away the remaining ends of wire, is obviated. The auxiliary holding members, which are located on opposite sides of the small pinion serving to twist the ends of wire, and between the two tensioning mem bers, are connected by means of push rods each to the opposite tensioning member, so that they move simultaneously with the ends of the wire.

The drawings show in a constructional form the new tensioning and locking device. Fig. 1 illustrates the same in use, as

seen looking downwards after the wire wound round a box or like article has been firmly tensioned, and just before the twisting of the wire ends which arelying one beside the other.

Fig. 2 is a view of the same device after the wire ends have been twisted together, but as seen in front elevation; Fig. 3 is a cross-section through the tensioning and locking device along the line 3-3 of Fig. 1. Fig. 4 shows the device for twisting the ends of the wire in side elevation.

Fig. 5 shows the auxiliary holding members in side elevation.

The tensioning and locking device consists in a known manner of a threaded spindle 0 having on one half a right hand thread and on the other a left hand thread, and rotatably mounted in two stationary brackets 6 upon a base plate a. The spindle 0 can be rotated in either direction by means of a. lever 01 which by means of anadjustable pawl f engages with a pinion 9 fast upon the threaded spindle 0. Two internally-threaded members h are also mounted upon the spindle c, and are" provided in front with a device for holding the ends of the wire. Between the two tensioning members It is located adevice for twisting the ends of the wire, which as shownfin Fig. 4 consists of several pinions which interengage and are located between the two cheeks i. The final driven pinion has a slot Z in which the two ends of the wire lie close to one another, being free however. The device for twisting the ends of wire m is actuated by means of a cranked handle 11., after the wire has been firmly tensioned by moving the two tensioning members It.

Whilst with the known tensioning. and locking devices for twisting wire the two ends of wire are drawn together past each other, and the ends used to fix the wires in the tensioning members have to be cut away after the twisting has taken place, with the new tensioning and locking device the ends of wire are pushed together past each other. To effect this, auxiliary holding members 0, which move simultaneously with the tensioning members k, are provided for holding the ends of wire m which are pushed together and past each other during the twisting operation. These auxiliary members are provided with a slot 1' in which the ends of wire lie closely side by side out free and are held therein bymeans of a dropcatch The auxiliary members 0 are arrange on opposite sides of the small pinion .70 for twisting the ends of wire and between the two tensioning members and are connected each with the opposite tensioning member 72. by means of rods ,9. Since the two rods 8 as well as the ends of wire m are pushed towards and past each other, the rod of one auxiliary member 0 passes freely throu h the other auxiliary member 0 and the c eeks of the device for twisting the wire ends, and vice versa. I

I'claim:

1.' In a tensioning and locking device for wire-binding mechanisms in' which the wire is finally twisted for securing purposes, tensioning members for straining the wire and auxiliary holding members receiving motion from said tensionin members and adapted to hold the ends -0 the wire which are pushed towards and past each other the twisting operation.

a tensioning and locking device for wire-binding mechanisms .in which the wire. is finally twisted for securing purposes, tensionin members for straining the wire, auxiliary oldin members for holding the ends of the wire uring the twisting operation,

and push rods connecting each auxiliary holding member to the opposite tensioning member.

3. In a tensioning and locking device for wire-binding mechanisms in which the wire is finally twisted for securing purposes, tensioning members for straining the Wire, auxiliary holding members for holding the ends of the wire during the twisting operation, and'push rods connecting each auxiliary holding member to the opposite tensioning member and passing slidably through i the other auxiliary holding member.

' 4. In a tensioning and locking device for wirebindin mechanisms in WhlCh the wire is finally twisted for securing purposes, tensionin members for straining the wire, auxiliar of tlZe wire 'during the twisting operation, drop-catches for securing said ends in said auxiliary holding members, and push-rods connecting each of said auxiliary members to the opposite tensioning auxiliary holding member.

EMIL 'HOFFMANN.

olding members for holding the ends 

